.\"	$OpenBSD: OCSP_cert_to_id.3,v 1.13 2024/08/24 19:31:09 tb Exp $
.\"	OpenSSL b97fdb57 Nov 11 09:33:09 2016 +0100
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.Dd $Mdocdate: August 24 2024 $
.Dt OCSP_CERT_TO_ID 3
.Os
.Sh NAME
.Nm OCSP_CERTID_new ,
.Nm OCSP_CERTID_free ,
.Nm OCSP_cert_to_id ,
.Nm OCSP_cert_id_new ,
.Nm OCSP_id_issuer_cmp ,
.Nm OCSP_id_cmp ,
.Nm OCSP_id_get0_info
.Nd OCSP certificate ID utility functions
.Sh SYNOPSIS
.In openssl/ocsp.h
.Ft OCSP_CERTID *
.Fn OCSP_CERTID_new void
.Ft void
.Fn OCSP_CERTID_free "OCSP_CERTID *id"
.Ft OCSP_CERTID *
.Fo OCSP_cert_to_id
.Fa "const EVP_MD *dgst"
.Fa "const X509 *subject"
.Fa "const X509 *issuer"
.Fc
.Ft OCSP_CERTID *
.Fo OCSP_cert_id_new
.Fa "const EVP_MD *dgst"
.Fa "const X509_NAME *issuerName"
.Fa "const ASN1_BIT_STRING *issuerKey"
.Fa "const ASN1_INTEGER *serialNumber"
.Fc
.Ft int
.Fo OCSP_id_issuer_cmp
.Fa "OCSP_CERTID *a"
.Fa "OCSP_CERTID *b"
.Fc
.Ft int
.Fo OCSP_id_cmp
.Fa "OCSP_CERTID *a"
.Fa "OCSP_CERTID *b"
.Fc
.Ft int
.Fo OCSP_id_get0_info
.Fa "ASN1_OCTET_STRING **piNameHash"
.Fa "ASN1_OBJECT **pmd"
.Fa "ASN1_OCTET_STRING **pikeyHash"
.Fa "ASN1_INTEGER **pserial"
.Fa "OCSP_CERTID *cid"
.Fc
.Sh DESCRIPTION
.Fn OCSP_CERTID_new
allocates and initializes an empty
.Vt OCSP_CERTID
object, representing an ASN.1
.Vt CertID
structure defined in RFC 6960.
It can store hashes of an issuer's distinguished name and public
key together with a serial number of a certificate.
It is used by the
.Vt OCSP_ONEREQ
object described in
.Xr OCSP_ONEREQ_new 3
and by the
.Vt OCSP_SINGLERESP
object described in
.Xr OCSP_SINGLERESP_new 3 .
.Fn OCSP_CERTID_free
frees
.Fa id .
.Pp
.Fn OCSP_cert_to_id
creates and returns a new
.Vt OCSP_CERTID
object using message digest
.Fa dgst
for certificate
.Fa subject
with issuer
.Fa issuer .
If
.Fa dgst
is
.Dv NULL
then SHA1 is used.
.Pp
.Fn OCSP_cert_id_new
creates and returns a new
.Vt OCSP_CERTID
using
.Fa dgst
and issuer name
.Fa issuerName ,
issuer key hash
.Fa issuerKey
and serial number
.Fa serialNumber .
.Pp
.Fn OCSP_id_issuer_cmp
compares the hash algorithms,
the hashed issuer distinguished names and
the hashed public keys of
.Vt OCSP_CERTID
.Fa a
and
.Fa b .
.Pp
.Fn OCSP_id_cmp
compares
.Vt OCSP_CERTID
.Fa a
and
.Fa b
using
.Fn OCSP_id_issuer_cmp
followed by a comparison of the certificate serial numbers with
.Xr ASN1_INTEGER_cmp 3 .
.Pp
.Fn OCSP_id_get0_info
returns the issuer name hash, hash OID, issuer key hash and serial
number contained in
.Fa cid .
If any of the values are not required, the corresponding parameter can be
set to
.Dv NULL .
The values returned by
.Fn OCSP_id_get0_info
are internal pointers and must not be freed up by an application:
they will be freed when the corresponding
.Vt OCSP_CERTID
object is freed.
.Pp
OCSP clients will typically only use
.Fn OCSP_cert_to_id
or
.Fn OCSP_cert_id_new :
the other functions are used by responder applications.
.Sh RETURN VALUES
.Fn OCSP_CERTID_new ,
.Fn OCSP_cert_to_id ,
and
.Fn OCSP_cert_id_new
return either a pointer to a valid
.Vt OCSP_CERTID
object or
.Dv NULL
if an error occurred.
.Pp
.Fn OCSP_id_cmp
and
.Fn OCSP_id_issuer_cmp
return 0 for a match or non-zero otherwise.
.Pp
.Fn OCSP_id_get0_info
returns 1 for success or 0 for failure.
.Sh SEE ALSO
.Xr ASN1_INTEGER_cmp 3 ,
.Xr EVP_DigestInit 3 ,
.Xr OCSP_request_add1_nonce 3 ,
.Xr OCSP_REQUEST_new 3 ,
.Xr OCSP_resp_find_status 3 ,
.Xr OCSP_response_status 3 ,
.Xr OCSP_sendreq_new 3 ,
.Xr X509_get_issuer_name 3 ,
.Xr X509_NAME_new 3 ,
.Xr X509_ocspid_print 3
.Sh STANDARDS
RFC 6960: X.509 Internet Public Key Infrastructure Online Certificate
Status Protocol, section 4: Details of the Protocol
.Sh HISTORY
These functions first appeared in OpenSSL 0.9.7
and have been available since
.Ox 3.2 .
